The invention discloses a spectrograph bracket suitable for a MIG welding process. The spectrograph bracket comprises a support base, a support frame, a vertical telescopic mechanism, a rotating mechanism, a bending mechanism, a fine adjustment mobile platform, a spectrograph optical fiber probe, a spectrograph optical fiber probe support, a light source, a focusing lens, a focusing lens holder, afocusing lens guide rail and a spectrograph host, wherein the support base is placed on an experimental platform, one end of the support frame is connected with the support base, the other end of thesupport frame is connected with the fine adjustment mobile platform. The spectrograph bracket is reasonable in structure, good in stability, high in precision, and free to adjust, optimizes the structure of a traditional spectrograph bracket device, overcomes defects in the structural stability and the poor regulation of the traditional device, is ensures adjustment precision, and realizes a purpose of improving the arc monitoring effect.